On Sun, 2006-03-12 at 18:57 -0800, Scott Lindstrom wrote: > OK, I admit it, I wasn't paying attention and > installed RP 1, 2 & 6 "backward". I have no > experience with resistor packs and don't know why a > resistor would be polarized.
You're right, they're not polarized. There are two types of resistor packs. One has completely separate resistors, with two pins for each resistor. The orientation of these doesn't matter. Some have only one pin for each resistor. The other side of all the resistors are connected together, and are connected to a single common pin, so the orientation does matter. Something like this (the X's represent resistors): ___________ | | | | | | | X X X X X | X X X X X | | | | | | If you install the resistor pack backwards, the common lead is in the wrong place. If you prefer, here's a nice little graphic showing the two types of resistor packs, which I found with Google Images: http://www.owlnet.rice.edu/~elec201/Book/images/assembly/img10.gif > So, the question is, is > this a critical error? I've tried to solder-wick them > out, but with through-plating, I'm thinking they'll > have to come out in pieces. You might want to try one of those spring-loaded solder suckers. However, it's often better to destroy the component than to risk damaging the board. A new board, plus all the components that are already soldered to it, plus the time and effort you already put into assembly, is worth a lot more than a resistor pack (which is quite cheap anyway). ... or use it as an excuse to buy a vacuum desoldering tool such as the Hakko 808... ;-) http://www.hakko.com/english/products/hakko_808.html _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
